50 years ago this week, Light My Fire by The Doors became the #1 single in the U.S.
Saw them play at Danbury High School around that same time.
Here's an excerpt from a NPR interview with keyboardist Ray Manzarek, originally broadcast in 1998, in which Ray explains how The Doors put the song together, how and why it was cut from the seven minute album version to 2:45 single, and why the instrumental break was inspired by The Sound of Music. The link takes you to the transcript and audio. Listening to the audio is much more fun.
And here's the original complete version: